US4202555A - Sealing ring - Google Patents

Sealing ring Download PDF

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Publication number
US4202555A
US4202555A US06/011,467 US1146779A US4202555A US 4202555 A US4202555 A US 4202555A US 1146779 A US1146779 A US 1146779A US 4202555 A US4202555 A US 4202555A
Authority
US
United States
Prior art keywords
bead
ring
lands
groove
sealing ring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/011,467
Other languages
English (en)
Inventor
Bernd Becker
Hans Forch
Adam Helfrich
Gottfried Jung
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Carl Freudenberg KG
Original Assignee
Carl Freudenberg KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Carl Freudenberg KG filed Critical Carl Freudenberg KG
Application granted granted Critical
Publication of US4202555A publication Critical patent/US4202555A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/328—Manufacturing methods specially adapted for elastic sealings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
    • B29C65/565—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits involving interference fits, e.g. force-fits or press-fits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/124—Tongue and groove joints
    • B29C66/1242—Tongue and groove joints comprising interlocking undercuts
    • B29C66/12423—Dovetailed interlocking undercuts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3248—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/26—Sealing devices, e.g. packaging for pistons or pipe joints
    • B29L2031/265—Packings, Gaskets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/709—Articles shaped in a closed loop, e.g. conveyor belts
    • B29L2031/7096—Rings or ring-like articles

Definitions

  • the invention relates to a sealing ring comprising a reinforcing ring made of a thermoplastic material and a lip ring with a circular bead which is set into a circular groove of the same profile in the reinforcing ring.
  • a sealing ring of this type is known from published examined German patent application (DE-AS) 2,312,548. It comprises a lip ring made of an elastomeric material and having a flangelike projection. Disposed on either side of this flangelike projection are the two parts of the reinforcing ring, which are bonded, welded or riveted to each other. In addition to the three operations required to produce the components of the sealing ring, a fourth operation is therefore required to join the parts together.
  • the invention has as its object to modify a sealing ring of this type is such a way that it consists of fewer than three parts and can be produced in fewer than four operations.
  • this object is accomplished by the structure of the present invention wherein the reinforcing ring and the lip ring are concentrically nested and that one or more beads extend essentially radially outwardly, their profile being enlarged in the projecting portion in the manner of a wedge, the nominal diameter on which the bead or beads are disposed being smaller than the nominal diameter of the associated grooves. It has been found advantageous that the nominal diameter on which the bead or beads are disposed be at least about 0.5% smaller than the diameter of the grooves. Particularly advantageous is a difference in diameter of about 2%.
  • the bead or beads which extend essentially radially outwardly and whose projecting portions are enlarged in the manner of a wedge are in every case an integral part of the lip ring, made of an elastomeric material. Both the bead and the retaining part therefore have pronounced elastic properties which in accordance with the invention are utilized to provide a static seal between the lip ring and the reinforcing ring. It is surprising in this connection that even very low initial tensions will provide good sealing. This good sealing action is due particularly to the wedgelike compression which the profile of the beads undergoes in the direction of the particular point of application of the force. Due to the axial symmetry which underlies the construction of the sealing ring, perfectly balanced conditions prevail in this respect over the entire periphery.
  • two grooves in the reinforcing ring are associated with two beads on the lip ring, the beads and grooves being disposed in proximity to the opposed axial ends of the contact surfaces on both sides.
  • the reinforcing ring is produced first with a groove whose profile is uniformly or nonuniformly enlarged in the direction of the opening and bounded by lands; the bead of the prefabricated lip ring is set into the groove with radial expansion of the clamping portion in proximity thereto; and the land or lands are deformed in such a way that they uniformly enclose the bead. It is particularly advantageous if the lands are deformed by the application of pressure and/or heat. In accordance with another advantageous design, the lands are deformed by the use of high-frequency oscillations.
  • the method in accordance with the invention is based on the fact that reinforcing ring and the lip ring are produced first independently of each other. Then the bead or beads on the lip ring are set into the corresponding grooves in the reinforcing ring with simultaneous elastic deformation, and the profile of the grooves is adapted to that of the beads through permanent deformation. Upon the shrinkage which follows, the lip ring thus is operatively connected and interlocked with the reinforcing ring.
  • this prior art method is now modified in such a way that the reinforcing ring is produced in a first injection mold and with a groove whose profile is uniformly or nonuniformly enlarged in the direction of the opening bounded by the lands; that the lands are deformed in such a way that the groove is given a profile which internally is enlarged in the manner of a wedge; and that in a second injection mold an elastomeric material is extruded and vulcanized by the use of heat so that the bead and the lip ring are formed by filling the groove and the remaining cavity of the injection mold.
  • the lands it has proved particularly advantageous in this method for the lands to be deformed by the closing motion of the second mold when the elastomeric material is injected immediately thereafter and vulcanized with simultaneous heating of the lands.
  • axial projections uniformly distributed over the periphery may be provided in proximity to the construction. However, the height of the projections must not exceed about 75% of the width of the groove.
  • the reinforcing ring made of a thermoplastic material
  • the reinforcing ring is thus produced first in a separate step.
  • This is done by the use of a mold designed so that it contains the grooves, in which the finished reinforcing ring open radially inwardly, in the form of lands extending essentially in the axial direction.
  • This expedient makes it possible to give the grooves, in conjunction with the deformation of the lands which follows, a profile which internally is enlarged in the manner of a wedge without having to resort to more elaborate production techniques.
  • the wedgelike taper of the grooves in the direction of the point of connection of the particular bead, which in accordance with the invention is essential, does not pose any particular difficulties.
  • Good sealing is achieved with an angle of the sides of about 10° to 25° each. Particularly advantageous is an angle of about 15°.
  • the operative and interlocking connection between the lip ring and the reinforcing ring corresponds to the idea underlying the present invention insofar as vulcanization of the lip ring is followed by a cooling which gives rise to considerable dimensional shrinkage.
  • This shrinkage produces an elastic stress-induced distortion of the bead or beads in the grooves. Excellent mechanical interlocking of the two parts and an excellent seal at the line of contact are thus assured in every case.
  • the choice of the materials of construction for the reinforcing ring and the lip ring is not subject to any particular restrictions.
  • the reinforcing ring may be further reinforced by embedded glass fibers or, optionally, other elements. All that need to be borne in mind is that the usual vulcanizing temperatures are on the order of about 160° to 180° C. It is desirable that the plastic material used to make the reinforcing ring be plastically moldable at appropriate temperatures without, however, changing its shape on its own.
  • the lip ring is advantageously formed by the use of extrusion techniques with observation of the known limiting conditions.
  • compression-molding methods may be employed.
  • the effect of good anchorage and simultaneous sealing in accordance with the invention can be achieved only if such stress-induced distortion is assured.
  • FIG. 1 is a partial sectional view of a reinforcing ring with two grooves according to the invention
  • FIG. 2 is a partial sectional view of the ring of FIG. 1 with the lip ring mounted thereto;
  • FIG. 3 is a partial sectional view of the reinforcing ring of the invention with one groove
  • FIG. 4 is a partial sectional view of the ring of FIG. 3 with a lip ring mounted thereto.
  • a reinforcing ring 1 with two grooves 5 and 6 is bounded by bands 4, 10 and 3, 11 extending essentially in the axial direction.
  • FIG. 2 shows the same reinforcing ring after deformation of the lands 3, 4 and after the formation, and connection therewith, beads 12 and 13 of lip ring 2.
  • the radially inwardly open grooves 5 and 6 after deformation are enlarged to a wedgelike profile.
  • the grooves 5 and 6 enclose in interlocking manner the two beads 12, 13 formed from the elastically resilient material of construction of the lip ring 2. Due to the manufacturing process, the beads are initially tensioned themselves and relative to each other. The relative mobility of the sealing lip 9 is not impaired thereby. It is joined to the part 7 connecting the two beads 12, 13 through a membranelike intermediate part 8. The sealing ring is then held in place on a shaft by tension member 14.
  • FIG. 3 Shown in FIG. 3 is a reinforcing ring 21 having but one groove 26 which is bounded by two lands 23 and 211 extending essentially in the axial direction.
  • FIG. 4 shows the same reinforcing ring 21 after it has been joined to the lip ring 22 with deformation of the land 23.
  • the groove 26 is formed whose profile is enlarged in the manner of a wedge in the interior of the reinforcing ring and whose opening is directed radially inwardly.
  • the lip ring 22 has a dynamic-seal lip 29 and is joined to the bead 213 disposed in the groove 26 through a membranelike intermediate part 28.
  • Particularly the radial shrinkage of the bead 213 after the pressure relief due to installation or cooling results in excellent interlocking and sealing of the two components relative to each other.
  • the sealing ring in accordance with the present invention has a satisfactory overall stability and may therefore be employed in applications which heretofore have been reserved for shaft sealing rings having a metallic reinforcing ring.
  • Manufacture poses no problems and there is no need, for example, to use adhesives at the juncture between reinforcing ring and lip ring. Excellent sealing action is nevertheless assured.
  • the mechanical interlocking of the two components is excellent.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Gasket Seals (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
US06/011,467 1978-02-18 1979-02-12 Sealing ring Expired - Lifetime US4202555A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2807022 1978-02-18
DE2807022A DE2807022C2 (de) 1978-02-18 1978-02-18 Dichtring

Publications (1)

Publication Number Publication Date
US4202555A true US4202555A (en) 1980-05-13

Family

ID=6032368

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/011,467 Expired - Lifetime US4202555A (en) 1978-02-18 1979-02-12 Sealing ring

Country Status (7)

Country Link
US (1) US4202555A (it)
JP (1) JPS54111040A (it)
BR (1) BR7900978A (it)
DE (1) DE2807022C2 (it)
FR (1) FR2417696A1 (it)
GB (1) GB2015088B (it)
IT (1) IT1113455B (it)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4350351A (en) * 1980-12-17 1982-09-21 Martin A Eugene Manhole joint gasket assembly and joint formed therewith
US4527803A (en) * 1982-01-07 1985-07-09 O & S Manufacturing Company Bellows seal with groove edge folded over bead, for ball and socket joints
US4614347A (en) * 1984-01-27 1986-09-30 Draftex Industries, Limited Assembled trimming and sealing strip
US5588656A (en) * 1994-02-07 1996-12-31 Nok Corporation Crankshaft seal having resilient portion embedded in rigid retainer
US6269956B1 (en) * 1998-04-23 2001-08-07 Framatome Technologies, Inc. Disposable media filter
US20030223060A1 (en) * 2002-05-30 2003-12-04 General Electric Company Method, system and computer product for formulating a bi-directional color match
US20040080116A1 (en) * 2001-03-21 2004-04-29 Karl Keller Sealing device for roll bearings with compensation for radial offset
US20050167928A1 (en) * 2004-02-04 2005-08-04 Park Edward H. Dynamic seal using vulcanization of fluorocarbon elastomers
US20060290070A1 (en) * 2005-06-27 2006-12-28 Freudenberg-Nok General Partnership Reinforced elastomeric seal
US20070060707A1 (en) * 2003-06-17 2007-03-15 Freudenberg-Nok General Partnership Dynamic vulcanization of polyurethane elastomeric material in the presence of thermoplastics
US20070142555A1 (en) * 2004-02-04 2007-06-21 Freudenberg-Nok General Partnership Peroxide cured fluorocarbon elastomer compositions
US7662886B2 (en) 2005-06-29 2010-02-16 Freudenberg-Nok General Partnership Dynamic vulcanization of fluorocarbon elastomers containing peroxide cure sites

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3305765C1 (de) * 1983-02-19 1984-06-28 Goetze Ag, 5093 Burscheid Verschlussdeckel
JPS6085666U (ja) * 1983-11-14 1985-06-13 エヌオーケー株式会社 密封装置
GB2172941B (en) * 1985-03-30 1988-03-16 Ronald Geoffrey Mccoy Shaft seal
DE3612420A1 (de) * 1986-04-12 1987-10-15 Kaco Gmbh Co Radialwellendichtring
DE3720930A1 (de) * 1987-06-25 1989-01-05 Freudenberg Carl Fa Radialwellendichtring
JPH01159417A (ja) * 1987-12-15 1989-06-22 Nissan Motor Co Ltd 内燃機関の弁装置
GB2254896B (en) * 1991-04-19 1995-01-11 Dowty Seals Ltd Annular seals
JP6411035B2 (ja) * 2014-02-26 2018-10-24 三菱電線工業株式会社 回転軸シールの製造方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB544881A (en) * 1941-02-14 1942-04-30 Angus George Co Ltd Improvements in packing, fluid-sealing and dust excluding devices for plungers, pistons, shafts, bearings and the like
DE1194211B (de) * 1961-10-20 1965-06-03 Sulzer Ag Stopfbuchspackung
US3381970A (en) * 1964-10-16 1968-05-07 Otis Eng Co Low-friction high-pressure seal assembly
GB1371341A (en) * 1971-02-25 1974-10-23 Skf Uk Ltd Seals such as are used for a rolling bearing
US3980309A (en) * 1973-12-19 1976-09-14 Jacques Dechavanne Two-part scraper-type shaft-seal
US4053166A (en) * 1975-12-08 1977-10-11 Halogen Insulator & Seal Corporation Two-piece seal
US4141563A (en) * 1974-02-14 1979-02-27 Sperry Rand Corporation Power transmission

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR869366A (fr) * 1939-06-21 1942-01-30 Freudenberg Carl Anneau de joint, prêt au montage, pour organes de machine mobiles
FR1056617A (fr) * 1952-05-16 1954-03-01 Joint d'étanchéité pour arbres tournants
US3250541A (en) * 1962-03-08 1966-05-10 Chicago Rawhide Mfg Co Radial lip seals
GB1100768A (en) * 1965-09-02 1968-01-24 Leer Ind Ltd Van Method of forming a bushing of thermoplastic material in an opening in a sheet material wall and a bushing formed in an opening in a sheet material wall produced with said method
AT304971B (de) * 1968-08-02 1973-02-12 Jenoe Szepesvary Dipl Ing Dichtung, die als Radial- oder Axialdichtung ausgebildet ist
SE374690B (it) * 1971-07-01 1975-03-17 Forsheda Ideutveckling Ab
ZA724366B (en) * 1971-07-02 1973-03-28 Girling Ltd Permanent assemblies including thermoplastic components and method of assembly
DE2157015C2 (de) * 1971-11-17 1982-04-01 Industriewerk Schaeffler Ohg, 8522 Herzogenaurach Verfahren zur Herstellung einer Dichtung aus spritzbarem Werkstoff
GB1477074A (en) * 1975-01-31 1977-06-22 Hepworth Iron Co Ltd Manufacture of pipe couplings
NL170048B (nl) * 1976-01-29 1982-04-16 Wavin Bv Werkwijze voor het vervaardigen van een spuitgegoten mofbuis.

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB544881A (en) * 1941-02-14 1942-04-30 Angus George Co Ltd Improvements in packing, fluid-sealing and dust excluding devices for plungers, pistons, shafts, bearings and the like
DE1194211B (de) * 1961-10-20 1965-06-03 Sulzer Ag Stopfbuchspackung
US3381970A (en) * 1964-10-16 1968-05-07 Otis Eng Co Low-friction high-pressure seal assembly
GB1371341A (en) * 1971-02-25 1974-10-23 Skf Uk Ltd Seals such as are used for a rolling bearing
US3980309A (en) * 1973-12-19 1976-09-14 Jacques Dechavanne Two-part scraper-type shaft-seal
US4141563A (en) * 1974-02-14 1979-02-27 Sperry Rand Corporation Power transmission
US4053166A (en) * 1975-12-08 1977-10-11 Halogen Insulator & Seal Corporation Two-piece seal

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4350351A (en) * 1980-12-17 1982-09-21 Martin A Eugene Manhole joint gasket assembly and joint formed therewith
US4527803A (en) * 1982-01-07 1985-07-09 O & S Manufacturing Company Bellows seal with groove edge folded over bead, for ball and socket joints
US4614347A (en) * 1984-01-27 1986-09-30 Draftex Industries, Limited Assembled trimming and sealing strip
US5588656A (en) * 1994-02-07 1996-12-31 Nok Corporation Crankshaft seal having resilient portion embedded in rigid retainer
US6269956B1 (en) * 1998-04-23 2001-08-07 Framatome Technologies, Inc. Disposable media filter
US20040080116A1 (en) * 2001-03-21 2004-04-29 Karl Keller Sealing device for roll bearings with compensation for radial offset
US20030223060A1 (en) * 2002-05-30 2003-12-04 General Electric Company Method, system and computer product for formulating a bi-directional color match
US20070060707A1 (en) * 2003-06-17 2007-03-15 Freudenberg-Nok General Partnership Dynamic vulcanization of polyurethane elastomeric material in the presence of thermoplastics
US20050167928A1 (en) * 2004-02-04 2005-08-04 Park Edward H. Dynamic seal using vulcanization of fluorocarbon elastomers
US20070142555A1 (en) * 2004-02-04 2007-06-21 Freudenberg-Nok General Partnership Peroxide cured fluorocarbon elastomer compositions
US8485533B2 (en) 2004-02-04 2013-07-16 Freudenberg-Nok General Partnership Dynamic seal using vulcanization of fluorocarbon elastomers
US20060290070A1 (en) * 2005-06-27 2006-12-28 Freudenberg-Nok General Partnership Reinforced elastomeric seal
US7658387B2 (en) 2005-06-27 2010-02-09 Freudenberg-Nok General Partnership Reinforced elastomeric seal
US7662886B2 (en) 2005-06-29 2010-02-16 Freudenberg-Nok General Partnership Dynamic vulcanization of fluorocarbon elastomers containing peroxide cure sites

Also Published As

Publication number Publication date
BR7900978A (pt) 1979-09-25
JPS54111040A (en) 1979-08-31
GB2015088B (en) 1982-07-21
DE2807022C2 (de) 1982-07-01
DE2807022A1 (de) 1979-08-23
IT7947616A0 (it) 1979-01-12
FR2417696A1 (fr) 1979-09-14
GB2015088A (en) 1979-09-05
IT1113455B (it) 1986-01-20
JPS6123427B2 (it) 1986-06-05

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